FIX: Corrected how xml content was gathered.

Before, if you had an element and text within an element, you were unable to get the text unless it was before the element.
    Example: <node>text<param/></node> (this will work)
             <node><param/>text</node> (this would not work)

core/XdmfCoreReader.cpp

@@ -120,9 +120,9 @@ int globalCount;
 			std::map<std::string, std::string> itemProperties;
 			if(currNode->children != NULL)
 			{   
-                if(currNode->children->content != NULL)
-                    itemProperties["Content"] = (const char *)currNode->children->content;  
-                else itemProperties["Content"] = "";
+                xmlChar *content = xmlNodeGetContent(currNode);
+                itemProperties["Content"] = (char*)content;
+                xmlFree(content);
 				itemProperties["XMLDir"] = mXMLDir;
 			}
 			xmlAttrPtr currAttribute = currNode->properties;